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IB Biology HL C3.2.2 Skin and Mucous Membranes Questions

Explore how keratinized skin, mucus, cilia, lysozyme and acidic gastric juice trap, remove or destroy pathogens on respiratory and digestive surfaces in IB Biology HL C3.2.2.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how keratinized skin and shedding form a physical barrier that limits pathogen entry.
  • Explain how mucus and cilia trap or remove pathogens, while lysozyme and acidic gastric juice damage or destroy them on respiratory and digestive mucous membranes.

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Study C3.2.2—Skin and mucous membranes conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL C3.2.2 Skin and Mucous Membranes Questions question 1

[Maximum number: 2]

Pathogens are disease-causing organisms.

State two of the body's primary defences to pathogens.

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